Of the horses pictured, I like #1 the most. She is NOT too upright in front, tho she may be (and that is MAY) a little short for what you want to do. Because the photo is blurred it is very difficult to see if her legs are clean or not.
#2 is spindly and #3 is sickle hocked..
The last horse.. the A Circuit horse.. has puffy ankles with the off front looking really questionable and an over straight front leg. Hind legs are not so hot either.